I agree with Cosr on both points, especially since the movement speed of the character meant me sweating hard every time I had to jump a chasm of three blocks :P I like tight jumps, but it seemed just a tad too much.

On the plus side, however, I kind of liked the blocky graphical style. If you made the colour choice a bit grubbier or simplified the complete impression (think "Atari simple") it could stand well on its own.
There was obviously also the makings of a proper platformer. Tweaking movement and jumping a bit, add perhaps a few more items, and then the rest of the story - this could become a nice little gem.

It's a good start but there's a few things that break it:
For one, the player speed is annoyingly slow. Two, starting at the very beginning if dying is nasty.
It is a solid base for a bigger game though!

The thing that makes this game break is the slow speed combined with starting over wayyy at the beginning when dying. It would also be nice if the tiles where a bit prettier =)
So, speedup + newtiles + checkpoint = good platformer =)